Datasheet

15
LT3781
3781f
Figure 6. High-Current Transient Return Paths
LT3781
5V
REF
SGND
V
BST
V
BST
V
IN
BSTREF
V
CC
V
CC
PGND
Effective grounding can be achieved by considering the
return current paths from the sense resistor to each
respective bypass capacitor. Don’t be tempted to run
small traces to separate the grounds. A power ground
plane is important as always in high power converters, but
bypass elements must be oriented such that transient
APPLICATIO S I FOR ATIO
WUUU
currents in the return paths of V
IN
and V
CC
do not mix. Care
must be taken to keep these transients away from the
SGND reference. An effective approach is to use a 2-layer
ground plane, reserving an entire layer for SGND. The
5V
REF
and nonisolated converter output bypasses can
then be directly connected to the SGND plane.